package me.zk.practice1;

/**
 * @Author: zhang kai
 * @Date: 2022/10/27
 * @Description:
 */
public class Solution2 {
    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
        ListNode dummy = new ListNode(-1);

        ListNode pre = dummy;

        while (l1 != null && l2 != null) {
            if (l1.val <= l2.val) {
                pre.next = l1;
                l1 = l1.next;
            } else {
                pre.next = l2;
                l2 = l2.next;
            }
            pre = pre.next;
        }
        if (l1 != null) {
            pre.next = l1;
        }
        if (l2 != null) {
            pre.next = l2;
        }


    return dummy.next;
    }

    public static void main(String[] args) {

    }

}
